Articles | Volume 367
Proc. IAHS, 367, 93–98, 2015
https://doi.org/10.5194/piahs-367-93-2015
Proc. IAHS, 367, 93–98, 2015
https://doi.org/10.5194/piahs-367-93-2015

  03 Mar 2015

03 Mar 2015

Predicting location and length of ephemeral gullies with a process-based Topographic Index model

A. Y. Sheshukov A. Y. Sheshukov
  • Department of Biological and Agricultural Engineering, Kansas State University, 129 Seaton Hall, Manhattan, Kansas, USA

Keywords: Ephemeral gully, erosion, topographic index model, hydrology, GIS

Abstract. Ephemeral gully (EG) erosion can be a major source of sediment in agricultural watersheds and predicting the location and length of EGs is important to assess sediment source areas. Topographic index (TI) models utilize topographic-only factors to locate concentrated flow paths on agricultural fields. In this paper, the TI-model is expanded by incorporating an overland flow equation that describes surface excess rate, roughness, and soil critical shear stress. An un-calibrated Process-Based (PB) topographic index model was applied to an agricultural watershed in Central Kansas and the results were compared with a calibrated Slope-Area (SA) model. The analysis showed that the PB model slightly over-predicted topographic properties of ephemeral gullies compared to the observed data. Accuracy of the SA model depended on the selected threshold value.